CAPASS: Towards a Comprehensive Asteroseismic Catalogue of Kepler Red-giant stars.
Francisca Espinoza Rojas (Heidelberg Institute for Theoretical Studies, Germany)
Precise asteroseismic parameters derived from reliably identified oscillation modes are essential
for constraining stellar structure, testing stellar evolution theory, and deriving accurate stellar
parameters. In this seminar, I present the ongoing development of CAPASS (the Catalogue of
Asteroseismic Parameters for Stellar Structure), a catalogue of ~25,000 Kepler red giants that
provides global asteroseismic parameters (e.g., νmax and Δν), properties of individual modes
(frequencies, amplitudes, linewiths) and mode identification. Its construction required the
development of robust, fully automated unsupervised methods.
The inherent complexity of red-giant oscillation spectra presents a significant challenge for
automation and complicates reliable mode identification. In this context, I focus on two aspects
that limit large-scale analyses. First, I address power density spectra exhibiting multiple
oscillation power excesses and present strategies to characterise these systems. Second, I
introduce a novel method for identifying dipole (ℓ = 1) mixed modes based on spectral template
similarity. This robust approach can handle missing modes or spurious peaks and avoids strong
assumptions about parametric distributions.
These developments are intended to be integrated into the fully automated, data-driven pipeline,
TACO (Tools for the Automated Characterisation of Oscillations), and, together with it, form the
methodological spine of CAPASS. This framework will enable the reliable extraction of
asteroseismic information at unprecedented scale, opening the way to detailed population-level
studies of red-giant interiors.